GitLab

  to avoid database corruption when a user breaks out of a buildout
  with control-c.

- Don't save an installed database if there are no installed parts or
  develop egg links.


git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@73178 62d5b8a3-27da-0310-9561-8e5933582275